A5080209104- Graphene research and applications
- Quantum and electron transport phenomena
- Topological Materials and Phenomena
- Physics of Superconductivity and Magnetism
- Surface and Thin Film Phenomena
- Carbon Nanotubes in Composites
- Fullerene Chemistry and Applications
- Thermal properties of materials
- Advanced MEMS and NEMS Technologies
- Quantum Information and Cryptography
- 3D IC and TSV technologies
- Fractal and DNA sequence analysis
- Nanofabrication and Lithography Techniques
- Theoretical and Computational Physics
- Water-Energy-Food Nexus Studies
- Nonlinear Optical Materials Studies
- Wastewater Treatment and Reuse
- Composite Material Mechanics
- Advanced Physical and Chemical Molecular Interactions
- Advanced Condensed Matter Physics
- Complex Systems and Time Series Analysis
- Advanced Mathematical Theories and Applications
Princeton University
2020-2025
Interactions among electrons create novel many-body quantum phases of matter with wavefunctions that often reflect electronic correlation effects, broken symmetries, and collective excitations. A wide range has been discovered in MATBG, including correlated insulating, unconventional superconducting, magnetic topological phases. The lack microscopic information, precise knowledge possible thus far hampered our understanding MATBG's Here we use high-resolution scanning tunneling microscopy to...
We analytically compute the scanning tunneling microscopy (STM) signatures of integer-filled correlated ground states magic angle twisted bilayer graphene (TBG) narrow bands. After experimentally validating strong-coupling approach at ±4 electrons/moiré unit cell, we consider spatial features STM signal for 14 different many-body and assess possibility Kekulé distortion (KD) emerging lattice scale. Remarkably, find that coupling two opposite valleys in intervalley-coherent (IVC) TBG...
Abstract The unusual properties of superconductivity in magic-angle twisted bilayer graphene (MATBG) have sparked considerable research interest 1–13 . However, despite the dedication intensive experimental efforts and proposal several possible pairing mechanisms 14–24 , origin its remains elusive. Here, by utilizing angle-resolved photoemission spectroscopy with micrometre spatial resolution, we reveal flat-band replicas superconducting MATBG, where MATBG is unaligned hexagonal boron...
Hofstadter's butterfly, the predicted energy spectrum for non-interacting electrons confined to a two-dimensional lattice in magnetic field, is one of most remarkable fractal structures nature. At rational ratios flux quanta per unit cell, this shows self-similar distributions levels that reflect its recursive construction. For materials, butterfly under experimental conditions are unachievable using laboratory-scale fields. More recently, electrical transport studies have provided evidence...
The unusual properties of superconductivity in magic-angle twisted bilayer graphene (MATBG) have sparked enormous research interest. However, despite the dedication intensive experimental efforts and proposal several possible pairing mechanisms, origin its remains elusive. Here, using angle-resolved photoemission spectroscopy with micrometer spatial resolution, we discover replicas flat bands superconducting MATBG unaligned hexagonal boron nitride (hBN) substrate, which are absent...
We describe the design, construction, and performance of an ultra-high vacuum (UHV) scanning tunneling microscope (STM) capable imaging at dilution-refrigerator temperatures equipped with a vector magnet. The primary objective our design is to achieve high level modularity by partitioning STM system into set easily separable, interchangeable components. This naturally segregates UHV needs instrumentation from typically non-UHV construction dilution refrigerator, facilitating usage materials...
At partial fillings of its flat electronic bands, magic-angle twisted bilayer graphene (MATBG) hosts a rich variety competing correlated phases that show sample-to-sample variations. Divergent phase diagrams in MATBG are often attributed to the sublattice polarization energy scale, tuned by degree alignment hexagonal boron nitride (hBN) substrates typically used van der Waals devices. Unaligned exhibits unconventional superconductor and insulator phases, while nearly perfectly aligned...
Contemporary quantum materials research is guided by themes of topology and electronic correlations. A confluence these two engineered in "moir\'e materials", an emerging class highly tunable, strongly correlated two-dimensional (2D) designed the rotational or lattice misalignment atomically thin crystals. In moir\'e materials, dominant Coulomb interactions among electrons give rise to collective phases, often with robust topological properties. Identifying mechanisms responsible for exotic...
A n fternoon with P rofessor H ermanowicz : E xploring S ustainability and W ater F iltration By: Harshika Chowdhary, Luis Castro, Phillipa McGuinness, Juwon Kim, Saavan Patel, Kevin Nuckolls, Manraj Gill. B J BSJ had the distinct pleasure honor of interviewing Dr. Slav Hermanowicz. Hermanowicz is an Environmental Engineering professor at University California Berkeley. His research focuses on process water quality treatment so that wastewater can be reused. Another aspect Hermanowicz’s...
At partial fillings of its flat electronic bands, magic-angle twisted bilayer graphene (MATBG) hosts a rich variety competing correlated phases that show sample to variations. Divergent phase diagrams in MATBG are often attributed the sublattice polarization energy scale, tuned by degree alignment hexagonal boron nitride (hBN) substrates typically used van der Waals devices. Unaligned exhibits unconventional superconductivity and insulating phases, while nearly perfectly aligned MATBG/hBN...